CN115183584A - Multistage flow equalization sintering device and method - Google Patents

Abstract

The invention provides a multistage flow equalizing sintering device and method, and relates to the technical field of sintering. The multistage flow-equalizing sintering method is applied to a multistage flow-equalizing sintering device, the multistage flow-equalizing sintering device comprises a sintering furnace body, a graphite box, a heating element and a gas-equalizing element, gas entering from a gas inlet uniformly flows to all parts of a flow-equalizing channel through the gas-equalizing element, the gas is heated by the heating element, and the heated gas is uniformly diffused to the peripheral wall of the graphite box, so that the uniformity of an atmosphere field and a thermal field is ensured, and the quality and the consistency of sintered products of the multistage flow-equalizing sintering device are further ensured.

Description

Multistage flow equalization sintering device and method

Technical Field

The invention relates to the technical field of sintering, in particular to a multistage flow equalizing sintering device and method.

Background

The vacuum multi-stage flow equalizing sintering device is equipment for sintering a heated material in a vacuum environment, and is widely applied to a plurality of fields such as metal heat treatment, magnetic materials, powder metallurgy, electronic ceramics and the like. In the existing hard alloy sintering process, gas with lower temperature needs to be introduced into the multistage flow-equalizing sintering device, and then the gas is permeated into a sintering space through a graphite box to take away wax gas generated in the sintering process.

The inventor researches and discovers that the arrangement mode of the existing gas inlets makes the gas difficult to be uniformly distributed in the inner space of the multistage flow equalizing sintering device, and further causes the problem of insufficient quality and quality consistency of the sintered product.

Disclosure of Invention

The invention aims to provide a multistage flow-equalizing sintering device, which can enable gas entering from a gas inlet to uniformly flow to each part of a flow-equalizing channel through a gas-equalizing piece, so that the quality and the consistency of the sintered product of the multistage flow-equalizing sintering device are ensured.

The embodiment of the invention is realized by the following steps:

in a first aspect, the present invention provides a multi-stage flow equalization sintering apparatus, comprising:

the sintering furnace comprises a sintering furnace body, wherein the outer wall of the sintering furnace body is provided with an air inlet and an air outlet;

the graphite box is arranged in the sintering furnace body, and the inner cavity of the graphite box is communicated with the exhaust port;

the heating element comprises a plurality of heating rods, the plurality of heating rods surround the peripheral wall of the graphite box and are arranged at intervals along the circumferential direction of the graphite box, and the heating element can uniformly diffuse gas heated by the heating rods to the peripheral wall of the graphite box;

the piece of samming, the piece of samming is located between fritting furnace body and the heating member and is connected with fritting furnace body inside wall, and the airflow channel who communicates with the air inlet is seted up to the piece of samming, forms the passageway that flow equalizes with the airflow channel intercommunication between the piece of samming and the heating member, and airflow channel is used for the even each position that flows to the samming passageway of the gaseous even flow direction that will get into from the air inlet.

In optional embodiment, the gas homogenizing piece is cylindric and has a breach, the breach extends to the other end from one end along axial direction, airflow channel has the air inlet recess with the air inlet intercommunication, airflow channel still has the first gas groove that looses that extends along the circumferencial direction and looses the gas groove along a plurality of seconds of axial extension, every second looses the gas groove and looses the gas groove intercommunication with first, air inlet recess and the first gas groove intercommunication that looses, a plurality of seconds loose the gas groove and set up along the circumferencial direction interval, every second looses the gas groove and offers a plurality of gas exhaust holes that loose that a plurality of edges self extending direction interval set up.

In optional embodiment, multistage sintering device that flow equalizes still includes the heat preservation piece, the heat preservation piece is the cavity cylindricly, heat preservation lateral wall and this body coupling of fritting furnace, the inside wall that the heat preservation piece is close to the gas vent is provided with the arch, the arch is the disc and laminates with the heat preservation piece, the arch is laminated in order to form the cylindric heat preservation of cavity with the inside wall laminating of breach looks adaptation and the lateral wall of gas-homogenizing piece with the heat preservation piece, the heat preservation inlet port that communicates with the recess that admits air is seted up to the heat preservation piece, the heat preservation is coaxial with graphite box and fritting furnace body.

In an alternative embodiment, the plurality of air diffusion holes in the plurality of second air diffusion grooves are alternately arranged, each second air diffusion groove corresponds to one heating rod, and the air exhausted from the plurality of air diffusion holes in each second air diffusion groove is blown to one heating rod.

In an alternative embodiment, the air diffusion hole is a tapered hole, the diameter of the air diffusion hole gradually increases along the direction close to the heating rod, and the side wall of the air diffusion hole is tangent to the heating rod along the direction close to the heating rod.

In optional embodiment, the heating member includes first heating portion and two second heating portions, two second heating portions set up along first heating portion symmetry, between two second heating portions and all be connected through smooth arc board between first heating portion and the second heating portion, second heating portion and first heating portion all include a plurality of heating rods and a plurality of with even diffusion gaseous aeration plate, every heating rod length direction's both sides all are provided with two aeration plates and two aeration plates are the contained angle setting, two arbitrary adjacent heating rods all connect through aeration plate, and two aeration plates are the contained angle and connect, and are a plurality of the heating rod surround in the periphery wall of graphite box and follow the circumference interval setting of graphite box.

In an optional embodiment, the vent plate is hollow, a plurality of first vent holes are formed in one side, close to the gas homogenizing piece, of the vent plate, a plurality of second vent holes are formed in one side, close to the stone ink box, of the vent plate, the first vent holes and the second vent holes are arranged alternately, the first vent holes and the second vent holes are conical holes, the hole diameter of the second vent holes is gradually reduced along the direction close to the stone ink box, and the hole diameter of the first vent holes is gradually reduced along the direction close to the gas homogenizing piece.

In an alternative embodiment, a plurality of heating rods are further arranged on one side, close to the stone ink box, of the smooth arc plate between the two second heating parts, and the plurality of heating rods are symmetrically arranged along the axis of the air inlet.

In an optional embodiment, the multistage flow-equalizing sintering device further comprises a wax gas collecting pipe, the wax gas collecting pipe is arranged in the graphite box and comprises an outer pipe and an inner pipe, a wax gas exhaust hole communicated with the exhaust port is formed in the middle of the outer pipe, outer holes are further formed in the outer side wall of the outer pipe and are symmetrically arranged with the axis of the wax gas exhaust hole, a plurality of inner holes are formed in the side wall of the inner pipe, and the inner pipe is rotatably connected with the outer pipe.

In a second aspect, the present invention further provides a multistage current-sharing sintering method, which is used for the above multistage current-sharing sintering apparatus, and includes:

heating the graphite box through a heating element, and preheating the graphite box to the flow equalizing channel through the heating element;

air is fed through the air inlet, and enters the flow equalizing channel through the air equalizing piece;

gas rethread heating member heating through the passageway that flow equalizes to through the peripheral wall of heating member evenly diffusion to graphite box, rethread graphite box peripheral wall evenly gets into in the graphite box.

The embodiment of the invention has the beneficial effects that: the invention provides a multistage flow-equalizing sintering device and a multistage flow-equalizing sintering method. And the recess that admits air is located the middle part of gas equalizing piece axial direction and the middle part of circumference direction through the middle part in first gas groove that looses, also admits air the recess, can guarantee through gas equalizing piece combustion gas can be more even diffusion to the passageway that flow equalizes. The gas that will follow the air inlet entering through the gas piece evenly flows to each position of the equal flow channel to the rethread adds the heating member heating, and evenly diffuses the gas that will heat to the periphery wall of graphite box, has guaranteed the even of atmosphere field and thermal field, and then guarantees the quality and the quality uniformity of multistage sintering device sintering product that flow equalizes.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a multi-stage current-sharing sintering apparatus according to a first embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a multi-stage flow-equalizing sintering apparatus according to a first embodiment of the present invention;

FIG. 3 is a schematic structural view of a gas-distributing member according to a first embodiment of the present invention;

FIG. 4 is a schematic view illustrating the relationship between the heating rod and the air-channeled panel and the air-equalizing member according to the first embodiment of the present invention;

fig. 5 is a schematic structural view of a heating element according to a first embodiment of the present invention; FIG. 6 is a schematic view of a heating rod and an air-permeable plate according to an embodiment of the present invention shown in a first view;

FIG. 7 is a schematic view of the connection between the heating rod and the ventilation board in a second view according to the first embodiment of the present invention;

FIG. 8 is an enlarged partial schematic view of FIG. 7;

FIG. 9 is a schematic structural view of an outer tube according to a first embodiment of the present invention;

FIG. 10 is a schematic structural view of an inner tube according to a first embodiment of the present invention;

FIG. 11 is a first schematic illustration of a workpiece being sintered according to a first embodiment of the invention;

FIG. 12 is a second schematic view of a workpiece being sintered according to the first embodiment of the invention;

fig. 13 is a schematic flow chart of a multistage flow-equalizing sintering method according to a second embodiment of the present invention.

An icon: 1-a multi-stage flow equalizing sintering device; 10-sintering furnace body; 11-an air inlet; 12-an exhaust port; 20-a graphite box; 30-a heating element; 31-a heating rod; 32-a breather plate; 321-a first vent; 322-a second vent; 33-smooth arc plate; 40-air homogenizing piece; 41-a first gas dispersing groove; 42-a second air dispersing groove; 421-air exhaust hole; 43-air inlet grooves; 44-notch; 50-heat preservation pieces; 51-heat preservation air inlet holes; 52-bump; 60-wax vapor collection tubes; 61-an outer tube; 62-outer pores; 621-a first hole; 622 — second hole; 623-wax air vent; 63-inner tube; 64-an inner hole; 641-third aperture; 642-fourth hole; 643-fifth hole; 70-a carrier; 71-a carrier table; 72-support member.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

The first embodiment:

referring to fig. 1-3, a multistage flow-equalizing sintering device 1 according to an embodiment of the present invention includes a sintering furnace body 10, a graphite box 20, a heating element 30, and a gas-equalizing element 40.

Wherein the outer wall of the sintering furnace body 10 is provided with an air inlet 11 and an air outlet 12, the graphite box 20 is arranged in the sintering furnace body 10, and the inner cavity of the graphite box 20 is communicated with the air outlet 12. The heating member 30 is for generating heat, the heating member 30 includes a plurality of heating rods 31, the plurality of heating rods 31 surround the outer circumferential wall of the cartridge 20 and are provided at intervals in the axial direction of the graphite cartridge 20, and the heating member 30 can uniformly diffuse gas heated by the heating rods 31 to the outer circumferential wall of the graphite cartridge 20.

The gas-homogenizing piece 40 is located between the sintering furnace body 10 and the heating piece 30 and is connected with the inner side wall of the sintering furnace body 10, the gas flow channel communicated with the gas inlet 11 is arranged on the gas-homogenizing piece 40, the gas flow channel communicated with the gas flow channel is formed between the gas-homogenizing piece 40 and the heating piece 30, and the gas flow channel is used for enabling gas entering from the gas inlet 11 to uniformly flow to each part of the gas flow channel.

It can be understood that, after the gas passes through the gas inlet 11, the gas is dispersed in the gas channel passing through the gas homogenizing element 40, so that the gas can more uniformly flow into the flow equalizing channel between the gas homogenizing element 40 and the heating element 30, and the uniformity of the atmosphere field in the multistage flow equalizing sintering device 1 can be ensured. The gas entering from the gas inlet 11 uniformly flows to all parts of the flow equalizing channel through the gas equalizing part 40, the gas is heated by the heating part 30, and the heated gas is uniformly diffused to the peripheral wall of the graphite box 20, so that the uniformity of an atmosphere field and a thermal field is ensured, and the quality consistency of sintered products of the multistage flow equalizing sintering device 1 can be ensured.

In this embodiment, the heating rod 31 can be when heating, to facing heat preservation one side, also preheat to being close to sintering furnace body 10 one side, can also heat to graphite box 20 one side simultaneously, the heating rod 31 adopts "a stick dual-purpose" mode, not only can preheat sintering furnace body 10 one side, can also heat graphite box 20 one side, on the basis that does not change the heating structure, the utilization ratio of heating rod has been promoted, the heating efficiency of multistage flow equalizing sintering device 1 has been improved.

Further, the gas homogenizing element 40 is cylindrical and has a notch 44, the notch 44 extends from one end to the other end along the axial direction, in other words, the notch 44 defines the cylindrical gas homogenizing element 40 as an open-loop disc shape, the air flow channel has an air inlet groove 43 communicated with the air inlet 11, the air flow channel further has a first gas dispersing groove 41 extending along the circumferential direction and a plurality of second gas dispersing grooves 42 extending along the axial line, each second gas dispersing groove 42 is communicated with the first gas dispersing groove 41, the air inlet groove 43 is communicated with the first gas dispersing groove 41, the plurality of second gas dispersing grooves 42 are arranged at intervals along the circumferential direction, and each second gas dispersing groove 42 is provided with a plurality of gas dispersing exhaust holes 421 arranged at intervals along the extending direction. In detail, in the present embodiment, each of the second air dispersing grooves 42 is disposed with the first air dispersing groove 41, in other words, the first air dispersing groove 41 is located at the middle of the air homogenizing member 40. And air inlet groove 43 passes through the middle part of first gas dispersing groove 41, and that is air inlet groove 43 is located the middle part of the even gas piece 40 axial direction and the middle part of circumferential direction, can guarantee that the gas that passes through even gas piece 40 combustion can be more even the diffusion to the passageway that flow equalizes.

In this embodiment, the plurality of air exhaust holes 421 in the plurality of second air exhaust grooves 42 are alternately arranged, in other words, for any two adjacent second air exhaust grooves 42 arranged at intervals, the circumferences of the air exhaust holes 421 on the two second air exhaust grooves 42 do not coincide with each other. And the gas discharged from the plurality of gas discharge holes 421 of each second gas discharge groove 42 is blown to one heating rod, so that the gas can be ensured to be more uniform during heat exchange. Specifically, referring to fig. 4, the air diffusing and exhausting hole 421 is a tapered hole, the diameter of the air diffusing and exhausting hole 421 increases gradually along the direction close to the heating rod 31, and the sidewall of the air diffusing and exhausting hole 421 is tangent to the heating rod 31 along the direction close to the heating rod 31, in other words, the extension surface of the sidewall of the air diffusing and exhausting hole 421 is tangent to the heating rod 31, which ensures that the blown air can be blown to one heating rod 31, and defines the diverging path of the air discharged from the air diffusing and exhausting hole 421. The heating efficiency of heating rod 31 to gas is improved, the gas that the gas exhaust hole 421 spent gas can be more even with the contact of heating rod 31 and then carry out the heat exchange with the heat that heating rod 31 produced also guaranteed for the thermal field is more even.

Specifically, in this embodiment, first gas groove 41 and every second gas groove 42 that looses communicate through two connecting holes, in other words, the passageway that lies in first gas groove 41 both sides in the second gas groove 42 that looses all communicates through the connecting hole, in order to guarantee that gaseous entering air inlet groove 43 back, gaseous can be smooth through first gas groove 41 that looses and disperse to each along a plurality of second gas grooves 42 that the contour interval set up, and then make gaseous even discharge to the passageway of flow equalizing. The distance between the two side walls of the first air dispersing groove 41 is greater than the aperture of the connecting hole, that is, the width of the air path formed by the first air dispersing groove 41 is greater than the aperture of the connecting hole.

Further, in this embodiment, the multistage flow equalizing sintering device 1 further includes a heat preservation member 50, the heat preservation member 50 is in a hollow cylindrical shape, an outer side wall of the heat preservation member 50 is connected with the sintering furnace body 10, a protrusion 52 is disposed on an inner side wall of the heat preservation member 50 close to the exhaust port 12, and it should be noted that the exhaust port 12 and the air inlet 11 in this embodiment are on the same axis. That is, the protrusion 52 is located at one end of the inner side wall of the thermal insulation member 50 away from the air inlet 11 and close to the air outlet 12. The bulge 52 is in a circular plate shape and is attached to the heat preservation piece 50, the bulge 52 is matched with the notch 44 of the gas homogenizing piece 40, and the outer side wall of the gas homogenizing piece 40 is attached to the inner side wall of the heat preservation piece 50 to form a heat preservation layer in a pile hole cylindrical shape. And the heat preservation piece 50 is provided with a heat preservation air inlet 51 communicated with the air inlet groove 43. Easy understanding, through setting up heat preservation 50 at multistage sintering device that flow equalizes 1, when heating rod 31 heats, when preheating to the one side of keeping away from stone ink horn 20, the heat of preheating can be preserved by heat preservation 50, reduce thermal scattering and disappearing, and then after gaseous entering, earlier carry out the heat exchange with the heat preservation, preheat with heating rod 31 contact again, and then gaseous and graphite box 20 temperature's gradient when reducing and graphite box 20 contact, further guarantee the stability in thermal field, in order to guarantee stone ink horn 20 interior sintering product quality.

The heat preservation layer is coaxial with the graphite box 20 and the sintering furnace body 10, and it can be understood that, because the heat preservation layer is coaxial with the graphite box 20 and the sintering furnace body 10, the distance between each part of the heat preservation layer and the graphite box 20 is equal, and the distance between each part of the heat preservation layer and the sintering furnace body 10 is equal, the uniformity of an atmosphere field during gas diffusion is further ensured, and the quality of a sintered product is also ensured.

Referring to fig. 5 to 8, further, the heating member 30 includes a first heating portion and two second heating portions, the two second heating portions are symmetrically disposed along the first heating portion, and the two second heating portions and the first heating portion and the second heating portion are connected by the smooth arc plate 33, in other words, one end of one of the second heating portions, which is far away from the first heating portion, is connected to the other second heating portion by the smooth arc plate 33, one side of the first heating portion is connected to the one second heating portion by the smooth arc plate 33, and the other side of the first heating portion is connected to the other second heating portion by the smooth arc plate 33.

Second heating portion and first heating portion all include a plurality of heating rod 31 and a plurality of aeration plate 32 that are used for even diffusion gas, and every heating rod 31 length direction's both sides all are provided with two aeration plate 32 and are the contained angle setting. For any two adjacent heating rods 31 in the first heating part or the second heating part, any two adjacent heating rods 31 are connected through the air vent plates 32, and the two air vent plates 32 are connected at an included angle. It can be understood that two aeration plates 32 are disposed at two sides of the heating rod 31 in the length direction, and two adjacent heating rods 31 are connected by the aeration plates 32. It is easily understood that the heating rod 31 is not provided on the smooth arc plate 33 between the first heating part and the second heating part, and thus the first heating part and the second heating part are connected by the smooth arc plate 33 and are not connected by the air-passing plate 32.

In the present embodiment, the gas equalizer 40 has a disc shape and a plurality of second gas diffusion grooves 42 extending in an axial direction, and the number of the second gas diffusion grooves 42 is equal to the sum of the numbers of the heating rods 31 in the first heating unit and the two second heating units, that is, the number of the second gas diffusion grooves 42 is equal to the sum of the number of the heating rods 31 in the first heating unit and the number of the heating rods 31 in the two second heating units. It is ensured that each heating rod 31 on the first heating part and the second heating part can correspond to one second air-dispersing groove 42. That is, the connecting line of the axes of the plurality of heating rods 31 defining the two second heating units and the first heating unit is arc-shaped.

It can be understood that, when the gas uniformly flows out from the gas homogenizing member 40 and then contacts the heating rod 31, the heated gas will move when the gas contacts the heating rod 31 with a higher temperature because the temperature of the heating rod 31 is higher than the gas temperature, and the uniformity of the atmosphere field is reduced. In order to ensure the uniformity of the atmosphere field around the cartridge 20 and the uniformity of the gas temperature, air plates 32 are provided at both sides of the heating rod 31 in the longitudinal direction thereof so as to form an included angle. The aeration plate 32 is used for uniformly diffusing gas, so that the gas is in contact with the graphite box 20, and must pass through the aeration plate 32, the gas is further heated on the aeration plate 32, the temperature difference between the gas and the graphite box 20 is further reduced, and the gas which is heated and mixed passes through the aeration plate 32 to be uniformly diffused into the space between the graphite box 20 and the heating element 30, so that the uniformity of an atmosphere field and the temperature of the gas is further ensured. Thereby ensuring the quality of the sintered product.

In this embodiment, the vent plate 32 is hollow, a plurality of first vent holes 321 arranged at intervals are disposed on one side of the vent plate 32 close to the gas homogenizing member, a plurality of second vent holes 322 arranged at intervals are disposed on one side of the vent plate 32 close to the stone ink box 20, and the first vent holes 321 and the second vent holes 322 on each vent plate 32 are alternately disposed, in other words, the axis of each first vent hole 321 on the vent plate 32 does not coincide with the axis of the second vent hole 322, so that it is ensured that the gas heated by the heating rod 31 can be sufficiently combined in the cavity space of the vent plate 32, heat exchange between the gases is sufficiently realized, the temperature of the gas is ensured to be uniform, and then the gas is discharged from the second vent holes 322 and uniformly diffused to the periphery of the graphite ink box 20.

Further, in this embodiment, the first vent hole 321 and the second vent hole 322 are both tapered holes, the aperture of the second vent hole 322 gradually decreases in the direction approaching the ink bottle 20, and the aperture of the first vent hole 321 gradually decreases in the direction approaching the air equalizing member. It will be readily understood that the gas enters the cavity of the vent plate 32 through the first vent holes 321 with gradually larger diameters, exits the cavity through the second vent holes 322 with gradually smaller diameters, and the gas can be mixed more sufficiently in the cavity and the heat exchange is more sufficient because the first vent holes 321 and the second vent holes 322 are alternately arranged.

Further, in this embodiment, a plurality of heating rods 31 are further provided on the side of the smooth arc plate 33 between the two second heating parts, which is close to the cartridge 20, and the plurality of heating rods 31 are provided along the axis of the air inlet 11. Note that the uniformity of heating outside the cartridge 20 is ensured.

Please refer to fig. 2, fig. 11, and fig. 12. The multistage flow equalizing sintering device 1 further comprises a bearing piece 70, the bearing piece 70 comprises a bearing table 71 and a supporting piece 72, the bearing table 71 is provided with a plurality of air holes and is arranged in the graphite box 20, one end of the supporting piece 72 is connected with the bearing table 71, and the other end of the supporting piece is connected with the sintering furnace body 10. That is, the graphite box 20, the heating member 30 and the insulating layer are all provided with mounting holes for the support member 72 to penetrate through. As will be readily understood, the bearing member 71 is used for placing the workpiece to be sintered, and in order to ensure that the exhaust gas generated by sintering the workpiece can be more uniformly discharged out of the multi-stage flow-equalizing sintering device 1, the bearing member 70 is located in the middle of the body of the graphite box 20.

Referring to fig. 9-10, in the embodiment, the multistage flow-equalizing sintering device 1 further includes a wax gas collecting tube 60, the wax gas collecting tube 60 includes an outer tube 61 and an inner tube 63, the wax gas collecting tube 60 is disposed in the graphite box 20, a wax gas exhaust hole 623 for communicating with the exhaust port 12 is disposed in the middle of the outer tube 61, specifically, a graphite hole communicating with the exhaust port 12 is disposed in the middle of the graphite box 20, and the wax gas exhaust hole 623 is communicated with the exhaust port 12 through the graphite hole for exhausting waste gas generated by sintering products. The outer side wall of the outer tube 61 is further provided with a plurality of outer holes 62, the outer holes 62 can be communicated with the air holes, the outer holes 62 are symmetrically arranged with the axis of the wax air exhaust hole 623, and the inner wall 63 is provided with a plurality of inner holes 64.

It should be noted that the discharge of the wax gas (i.e., the exhaust gas) generated by sintering the workpiece also affects the uniformity of the atmosphere field in the sintering space in the cartridge 20, and therefore, the uniformity of the exhaust gas discharge is ensured. The inner tube 63 is rotatably connected to the outer tube 61.

It will be appreciated that controlling the number of outer holes 62 through which the outer tube 61 communicates with the outside can be achieved by rotation of the inner tube 63 and the outer tube 61. During sintering, a workpiece to be sintered can be placed in the middle of the bearing table 71, the wax gas collecting pipe 60 is located on the lower side of the bearing table 71 and is communicated with the exhaust port 12 through the wax gas exhaust hole 623, when the workpiece to be sintered is large, the length of the outer pipe 61 in the axial direction and the length of the outer hole 62 communicated with the outside are ensured to be corresponding to the length of the workpiece to be sintered in the axial direction by rotating the inner pipe 63, namely, the lengths are approximately kept consistent, and therefore waste gas generated by the workpiece can be discharged evenly and timely.

Further, in the present embodiment, the outer hole 62 on the outer tube 61 includes a plurality of first holes 621 and a plurality of second holes 622. The first holes 621 are divided into two groups, opposite two sides are arranged on the circumferential side wall of the outer tube 61, the wax air exhaust hole 623 is arranged on one side, the first holes 621 are arranged on the other side, and the two groups of first holes 621 are symmetrically arranged with the axis of the wax air exhaust hole 623. The second holes 622 are divided into two groups, the two groups of second holes 622 are arranged axisymmetrically with respect to the axis of the wax air discharge hole 623, and the second holes 622 in each group are axisymmetrically arranged with respect to the outer tube 61.

Specifically, the inner hole 64 includes a plurality of third holes 641, a plurality of fourth holes 642, and a plurality of fifth holes 643, the plurality of third holes 641 are disposed at the central portion of the inner tube 63 and are spaced apart in the circumferential direction of the inner tube 63, the plurality of fourth holes 642 are divided into four groups, two groups of fourth holes 642 are symmetrically disposed with the plurality of third holes 641, and four groups of fourth holes 642 are spaced apart in the axial direction of the inner tube 63, and the fourth holes 642 of each group are spaced apart in the circumferential direction of the inner tube 63. The third holes 641 are used for communicating with the wax air vent 623, and each group of the fourth holes 642 includes a plurality of large-diameter fourth holes 642 and a plurality of small-diameter fourth holes 642, each group of the plurality of large-diameter fourth holes 642 and the plurality of small-diameter fourth holes 642 are arranged at intervals in the circumferential direction, the number of the small-diameter fourth holes 642 is greater than that of the large-diameter fourth holes, the fourth holes 642 are arranged corresponding to the first holes 621, that is, can communicate with the first holes 621 through the fourth holes 642, the fifth holes 643 correspond to the second holes 622, the second holes 622 can communicate with the fifth holes 643, the plurality of fifth holes 643 are divided into four groups, two groups of the fifth holes 643 are arranged at intervals in the axial direction and are respectively arranged at two sides of the fourth holes 642, each group of the fifth holes 643 is arranged at the outer side wall of the inner tube 63 in a spiral manner and is distributed at two sides of the outermost group of the fourth holes 642, and the diameter of the fifth holes 643 is smaller than that of the small-diameter fourth holes 643. It should be noted that, the uniformity and timeliness of the discharge of the wax gas generated by sintering the workpiece also affect the sintering quality of the sintered product, please refer to fig. 11-12, for example, when there are few workpieces and the workpiece is placed in the middle of the carrier 71, the inner tube 63 is rotated to ensure that the large-aperture 642 is communicated with the first aperture 621, most of the second apertures 622 are blocked by the inner tube 63 to ensure that the wax gas can be quickly and uniformly sucked from the first aperture 621 and the fourth aperture 642 in time and discharged through the third aperture 641 and the wax gas discharge aperture 623, when there are many workpieces, i.e., more workpieces on the carrier 71, the inner tube is rotated to ensure that the fifth aperture 643 is communicated with the second aperture 622 and the small-aperture fourth aperture 642 is communicated with the first aperture 621, and the wax gas is absorbed through the small-aperture fourth aperture 642 and the fifth aperture 643, so that the capability of absorbing the wax gas in the inner aperture in the inner tube 63 can be ensured to be uniform as much as possible, thereby ensuring the uniformity and timeliness of the discharge of the wax gas to ensure the sintering quality. When rotating inner tube 63 in order to guarantee, can change the length of outer hole 62 in the intercommunication of axial direction on the outer tube 61, and then with the not equidimension sintering work piece of adaptation, can be simultaneously according to the work piece of different quantity and then through different hole 64 and outer hole 62 intercommunication, the waste gas that produces when guaranteeing the sintering can be even and timely discharge. Thereby ensuring the uniformity of the atmosphere field in the graphite box 20 to ensure the quality of the sintered workpiece.

It can be understood that the multistage flow-equalizing sintering device 1 provided by the invention can enable gas to uniformly diffuse in three stages through the gas equalizing part 40, the heating part 30 and the graphite box 20. Further, the wax gas can be uniformly discharged through the wax gas collecting header 60. Realize multistage flow equalization sintering, guarantee sintering quality.

In summary, according to the multistage flow-equalizing sintering device 1 provided by the present invention, after the gas enters the sintering furnace body 10 through the gas inlet 11, the gas can be uniformly diffused into the flow-equalizing channel through the gas-equalizing member 40, and the extension surface of the side wall of the gas-diffusing exhaust hole 421 is tangent to the heating rod 31, so that the blown gas can be blown to one heating rod 31, and a diffusion path of the gas discharged from the gas-diffusing exhaust hole 421 is defined. The heating efficiency of heating rod 31 to gas is improved, the gas that gas exhaust hole 421 spent gas also has been guaranteed can be more even contact and then carry out the heat exchange with the heat that heating rod 31 produced with heating rod 31, gaseous first air vent 321 that gradually becomes big through the aperture gets into the air vent 32 intracavity, leave the intracavity at second air vent 322 that gradually becomes little through the aperture, and because first air vent 321 and second air vent 322 set up in turn, therefore gaseous more abundant mixture in the cavity, heat exchange's more abundant. The temperature gradient between the gas and the graphite box 20 is small when the gas is dispersed around the graphite box 20, and the uniformity of the atmosphere field and the thermal field is further ensured, so that the quality of the sintered workpiece is ensured. The exhaust gas generated during sintering the workpiece can be exhausted through the wax gas exhaust pipe and the exhaust port 12, and the number of the outer holes 62 through which the outer pipe 61 communicates with the outside can be controlled by the rotation of the inner pipe 63 and the outer pipe 61. During sintering, a workpiece to be sintered can be placed in the middle of the bearing table 71, the wax gas collecting pipe 60 is located on the lower side of the bearing table 71 and is communicated with the exhaust port 12 through the wax gas exhaust hole 623, when the workpiece to be sintered is large, the inner pipe 63 can be rotated, the length of the outer pipe 61 in the axial direction and the length of the outer hole 62 communicated with the outside in the axial direction are ensured to be corresponding to the length of the workpiece to be sintered in the axial direction, namely, the length is approximately kept consistent, meanwhile, the workpiece to be sintered can be communicated with the outer hole 62 through different inner holes 64 according to different numbers of workpieces, waste gas generated by the workpiece can be uniformly and timely discharged, and quality consistency of a sintered product are ensured.

Second embodiment:

referring to fig. 13, fig. 13 is a schematic flow chart of a multi-stage current-sharing sintering method according to a second embodiment of the present invention.

The second embodiment of the present invention provides a multistage current-sharing sintering method, which is applied to the multistage current-sharing sintering device 1 of the above embodiments, and the basic principle and the generated technical effect are the same as those of the above embodiments, so that the beneficial effects of the present embodiment can refer to the corresponding contents of the above embodiments.

The multistage flow equalization sintering method comprises the following steps:

s100: the graphite box 20 is heated by the heating member 30 and preheated by the heating member 30 toward the flow equalizing passage.

S200: air is fed through the air inlet 11 and enters the flow equalizing channel through the flow equalizing member 40.

S300: the gas passing through the flow equalizing channel is heated by the heating element 30, and is uniformly diffused to the peripheral wall of the graphite box 20 by the heating element 30, and then uniformly enters the graphite box 20 through the peripheral wall of the graphite box 20.

Therefore, after the gas passes through the gas inlet 11, the gas is dispersed in the gas channel passing through the gas homogenizing member 40, so that the gas can more uniformly flow into the flow equalizing channel between the gas homogenizing member 40 and the heating member 30, and the uniformity of the atmosphere field in the multistage flow equalizing sintering device 1 can be ensured. Gas is heated through the heating element 30 again to and with the even diffusion of the gas of heating to the periphery wall of graphite box 20, guaranteed the even of atmosphere field and thermal field, because the stone ink horn 20 is porous medium, graphite box 20 can guarantee that the gas of infiltration evenly enters into the sintering space of graphite box 20 inside, therefore gas just can carry out tertiary even diffusion through gas homogenizing element 40, heating element 30 and stone ink horn 20 this moment. In addition, the wax gas can be uniformly discharged through the wax gas collecting pipe 60, and the quality consistency of sintered products of the multistage uniform flow sintering device 1 are further ensured.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A multi-stage flow equalization sintering device, comprising:

the sintering furnace comprises a sintering furnace body, wherein an air inlet and an air outlet are formed in the outer wall of the sintering furnace body;

the graphite box is arranged in the sintering furnace body, and the inner cavity of the graphite box is communicated with the exhaust port;

the heating element comprises a plurality of heating rods, the heating rods surround the peripheral wall of the graphite box and are arranged at intervals along the circumferential direction of the graphite box, and the heating element can uniformly diffuse gas heated by the heating rods to the peripheral wall of the graphite box;

the gas-homogenizing piece is positioned between the sintering furnace body and the heating pieces and connected with the inner side wall of the sintering furnace body, an airflow channel communicated with the gas inlet is formed in the gas-homogenizing piece, a flow-homogenizing channel communicated with the airflow channel is formed between the gas-homogenizing piece and the heating pieces, and the airflow channel is used for enabling gas entering from the gas inlet to uniformly flow to all parts of the flow-homogenizing channel.

2. The multi-stage flow equalizing sintering device according to claim 1, wherein:

the equal gas piece is cylindricly and has the breach, the breach extends to the other end from one end along axial direction, airflow channel have with the recess that admits air of air inlet intercommunication, airflow channel still has along the first gas groove that looses that the circumferencial direction extends and along a plurality of second gas grooves that loose of axial extension, every the second loose the gas groove with first gas groove intercommunication that looses, admit air the recess with first gas groove intercommunication that looses, it is a plurality of the second looses the gas groove and sets up along the circumferencial direction interval, every the second looses the gas groove and sets up a plurality of gas exhaust holes that loose that a plurality of self extending direction intervals set up.

3. The multi-stage flow equalization sintering device according to claim 2, characterized in that:

multistage sintering device that flow equalizes still includes the heat preservation piece, the heat preservation piece is cavity cylindricly, heat preservation lateral wall with this body coupling of fritting furnace, the heat preservation piece is close to the inside wall of gas vent is provided with the arch, the arch be the disc form and with the laminating of heat preservation piece, the arch with breach looks adaptation just the lateral wall of gas piece with the laminating of the inside wall of heat preservation piece is cavity cylindric heat preservation in order to form, the heat preservation piece seted up with the heat preservation inlet port of air inlet groove intercommunication, the heat preservation with the graphite box reaches the fritting furnace body is coaxial.

4. The multi-stage flow equalization sintering device according to claim 2, characterized in that:

a plurality of the air diffusion holes in the second air diffusion groove are alternately arranged, each of the second air diffusion grooves corresponds to one of the heating rods, and gas exhausted from the air diffusion holes in the second air diffusion groove is blown to one of the heating rods.

5. The multi-stage flow equalization sintering device according to claim 4, characterized in that:

the air exhaust hole that looses is the bell mouth, the air exhaust hole that looses is followed and is close to the direction aperture of heating rod increases gradually, the lateral wall in air exhaust hole that looses is followed and is close to the direction of heating rod with the heating rod is tangent.

6. The multi-stage flow equalizing sintering device according to claim 1, wherein:

the heating member includes first heating portion and two second heating portions, two the second heating portion is followed first heating portion symmetry sets up, all is connected through smooth arc board between two second heating portions and between first heating portion and the second heating portion, the second heating portion reaches first heating portion all includes a plurality ofly heating rod and a plurality of with even diffusion gas's aeration plate, every heating rod length direction's both sides all are provided with two aeration plate and two aeration plate are the contained angle setting, and arbitrary two are adjacent the heating rod all connects through aeration plate, and two aeration plate are the contained angle and connect.

7. The multi-stage flow equalization sintering device according to claim 6, characterized in that:

the ventilating plate is hollow, the ventilating plate is close to one side of the gas homogenizing piece is provided with a plurality of first air vents, the ventilating plate is close to one side of the graphite box is provided with a plurality of second air vents, every on the ventilating plate the first air vents with the second air vents are alternately arranged, the first air vents with the second air vents are tapered holes, the second air vents are close to the direction aperture of the stone ink box is gradually reduced, and the first air vents are close to the direction aperture of the gas homogenizing piece is gradually reduced.

8. The multi-stage flow equalization sintering device according to claim 6, characterized in that:

two smooth arc board between the second heating portion is close to one side of graphite box still is provided with a plurality of heating rods just a plurality of heating rods follow the axis symmetry setting of air inlet.

9. The multi-stage flow equalizing sintering device according to claim 1, wherein:

the multistage flow-equalizing sintering device further comprises a wax gas collecting pipe, the wax gas collecting pipe is arranged in the graphite box and comprises an outer pipe and an inner pipe, a wax gas exhaust hole communicated with the exhaust hole is formed in the middle of the outer pipe, outer holes are further formed in the outer side wall of the outer pipe and are symmetrically arranged with the axis of the wax gas exhaust hole, a plurality of inner holes are formed in the side wall of the inner pipe, and the inner pipe is rotatably connected with the outer pipe.

10. A multistage current-sharing sintering method applied to the multistage current-sharing sintering device according to any one of claims 1 to 9, the multistage current-sharing sintering method comprising:

heating the graphite box through the heating element, and preheating the graphite box to the flow equalizing channel through the heating element;

gas is fed through the gas inlet, and enters the flow equalizing channel through the gas equalizing piece;

the gas passing through the flow equalizing channel passes through the heating element for heating, and the gas passes through the heating element for uniformly diffusing to the peripheral wall of the graphite box and then passes through the peripheral wall of the graphite box for uniformly entering the graphite box.

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